"Gilles Lenfant" <glenfant at NOSPAM.bigfoot.com> writes: > Change the line that inits "nodes" againts this : > nodes = [None for dummy in range(10)] How about nodes = [None] * 10 ? <mike -- Mike Meyer <mwm at mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.